National Fire Alarm Code
23.18* SPECIAL REQUIREMENTS FOR LOW- POWER RADIO
188.8.131.52* When actuated, each low-power radio transmitter shall automatically transmit an alarm signal.
184.108.40.206 Each low-power radio transmitter shall automatically repeat alarm transmission at intervals not exceeding 60 seconds until the initiating device is returned to its non alarm condition.
220.127.116.11 Fire alarm signals shall have priority over all other wireless signals.
18.104.22.168 The maximum allowable response delay from activation of an initiating device to receipt and display by the receiver/fire alarm control unit shall be 10 seconds.
22.214.171.124 An alarm signal from a low-power radio transmitter shall latch at its receiver/fire alarm control unit until manually reset and shall identify the particular initiating device in alarm.
126.96.36.199 The low-power radio transmitter shall be specifically listed as using a transmission method that is highly resistant to misinterpretation of simultaneous transmissions and to interference (e.g. impulse noise and adjacent channel interference).
188.8.131.52 The occurrence of any single fault that disables transmission between any low-power radio transmitter and the receiver/fire alarm control unit shall cause a latching trouble signal within 200 seconds.
Exception: Until the expiration for this exception of June 30, 2013, the time period for a low-power radio transmitter with only a single, connected alarm initiating device shall be permitted to be increased to four times the minimum time interval permitted for a 1-second transmission up to the following:
(1) 4 hours maximum for a transmitter serving a single initiating device
184.108.40.206 A single fault on the signaling channel shall not cause an alarm signal.
220.127.116.11 The periodic transmission required to comply with 18.104.22.168 from a low-power radio transmitter shall ensure successful alarm transmission capability.
22.214.171.124 Reception of any unwanted (interfering)transmission by a retransmission device (repeater) or by the main receiver/ control unit, for a continuous period of 20 seconds or more, shall cause an audible and visible trouble indication at the main receiver/control unit. This indication shall identify the specific trouble condition as an interfering signal.
23.18.5 Output Signals from Receiver/Control. When the receiver/control is used to actuate remote appliances, such as notification appliances and relays, by wireless means, the remote appliances shall meet the following requirements:
1. Power supplies shall comply with Chapter 4 or the requirements of 6.17.2.
2. All supervision requirements of Chapter 4, Chapter 6 or 6.17.4 shall apply.
3. The maximum allowable response delay from activation of an initiating device to activation of required alarm functions shall be 10 seconds.
4. Each receiver/control shall automatically repeat alarm transmission at intervals not exceeding 60 seconds or until confirmation that the output appliance has received the alarm signal.
5. The appliances shall continue to operate (latch-in) until manually reset at the receiver/control.